These systems do work and have worked for years. They are also regularly tested by IIHS. See, for example: https://www.youtube.com/watch?v=TJgUiZgX5rE https://

These systems do work and have worked for years. They are also regularly tested by IIHS. See, for example: https://www.youtube.com/watch?v=TJgUiZgX5rE https://www.youtube.com/watch?v=TJgUiZgX5rE And Teslas at least used to do this too: https://www.youtube.com/watch?v=aJJfn2tO5fo https://www.youtube.com/watch?v=aJJfn2tO5fo If they no longer stop reliably to avoid hitting stationary objects, this is a serious problem that needs to be corrected.